Imaging device

Abstract

To provide an imaging apparatus that can efficiently dissipate heat generated in an image pickup device movable in a direction orthogonal to an optical axis.SOLUTION: An imaging apparatus (500) has an image pickup device part (11) that has a stationary unit (11c) and a movable unit (11b) movable with respect to the stationary unit, and a duct part (510) that forms an air channel. The movable unit has an image pickup device (11a) and a heat exchange member (521), and at least part of the heat exchange member is inserted into the inside of the duct part from an opening (512a) of the duct part.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an imaging device. [Background technology]

[0002] Conventionally, imaging devices have been known that optically correct image blur by moving an image sensor in a direction perpendicular to the optical axis to improve image quality. The image sensor is required to have sufficient heat dissipation capabilities because heat generated by the image sensor during image blur correction drive, continuous shooting, video shooting, and the like affects image quality.

[0003] Patent Document 1 discloses an imaging device in which a heat dissipation sheet such as a graphite sheet is attached to the back of a sensor unit having an imaging element to improve heat dissipation. This configuration reduces the load of the imaging element moving in a direction perpendicular to the optical axis. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-028940 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration disclosed in Patent Document 1, the amount of heat dissipation of heat generated by the imaging element is determined by the thickness and width of the heat dissipation sheet connected to the imaging element. In recent years, the amount of heat generated by the imaging element has increased due to improvements in the video performance of imaging devices. For this reason, in the configuration disclosed in Patent Document 1, it is difficult to sufficiently dissipate the amount of heat generated by the imaging element, and there is a possibility that the temperature rise of the imaging element cannot be eliminated. On the other hand, if the thickness or width of the heat dissipation sheet is increased to increase the amount of heat dissipation, the moving load of the imaging element increases.

[0006] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an imaging device capable of efficiently dissipating heat generated in an imaging element that is movable in a direction perpendicular to the optical axis. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided an imaging device comprising: an imaging element section having a fixed unit and a movable unit movable relative to the fixed unit; and a duct section forming an air flow path, the movable unit having an imaging element and a heat exchange member, at least a portion of the heat exchange member being inserted into the duct section through an opening of the duct section. the movable unit has a first shielding member surrounding the periphery of the heat exchange member, and the first shielding member is configured to seal a flow path from an internal space of the duct part to an external space at the opening of the duct part even when the movable unit moves. There are.

[0008] Other objects and features of the present invention will be described in the following embodiments. Effect of the Invention

[0009] According to the present invention, it is possible to provide an imaging device capable of efficiently dissipating heat generated in an imaging element that is movable in a direction perpendicular to the optical axis. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view of a digital camera according to a first embodiment. [Diagram 2] 1 is an exploded perspective view of a digital camera according to a first embodiment. [Diagram 3] 2 is an exploded perspective view of an imaging element section, a duct section, and a main board in the first embodiment. FIG. [Figure 4] 4 is a cross-sectional view of an imaging element portion, a duct portion, and a main board in the first and fourth embodiments. FIG. [Diagram 5] FIG. 2 is an exploded perspective view of an imaging element unit according to the first embodiment. [Figure 6] FIG. 2 is an exploded perspective view of an imaging element unit according to the first embodiment. [Figure 7] FIG. 2 is an exploded perspective view of a duct portion according to the first embodiment. [Figure 8]FIG. 2 is an internal configuration diagram of a duct portion in the first embodiment. [Figure 9] FIG. 2 is an internal configuration diagram of a duct portion in the first embodiment. [Figure 10] FIG. 11 is a perspective view of a heat exchange member according to a second embodiment. [Figure 11] 13 is a cross-sectional view of an imaging element portion, a duct portion, and a main board in a second embodiment. FIG. [Figure 12] FIG. 11 is a configuration diagram of a heat exchange member according to a third embodiment. [Figure 13] 13 is a configuration diagram of a heat exchange member, a cooling fin portion, a first shielding member, and a second shielding member in a fourth embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0012] [First embodiment] First, the external configuration of a digital camera (imaging device) 500 according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1(a) is a front perspective view of the digital camera 500, and Fig. 1(b) is a rear perspective view of the digital camera 500.

[0013] Various operating members for operating the digital camera 500 are attached to the rear cover 21. Explanation of members that are not related to this embodiment, such as operating members and display members, will be omitted. The rear cover 21 is formed with an air intake 21c for taking in air from a duct, which will be described later. The recording medium cover lid 21b is a cover for protecting an opening of a recording medium IF that stores a memory card for recording captured images. In addition, a rear display unit 31 is arranged on the rear cover 21.

[0014] The rear display unit 31 can detect touch operations on the display surface, and can display and set preview images and various settings. The rear display unit 31 is a so-called vari-angle monitor that is rotatably attached to the digital camera 500, and is stored in a display unit storage unit 21a provided in the rear cover 21. The front cover 20 is integrally formed with a grip unit 20a that is shaped so that the user can easily hold it with the right hand when holding the digital camera 500. The top cover 23 is attached with various operating members for operating the digital camera 500. The bottom cover 24 that protects the bottom surface is attached with a battery cover 24a for attaching and detaching a battery. The side cover 25 is formed with an exhaust port 25b for exhausting air from a duct that will be described later. The terminal cover 25a is a cover for protecting an external communication terminal mounted on a main board that will be described later and that will be used to connect a connection cable to an external device (not shown).

[0015] The optical axis 0 is an axis that passes through the center of the mount 26. An interchangeable lens (not shown) is attached to and detached from the mount 26. A lens communication terminal 26a for electrically communicating with the interchangeable lens is disposed inside the mount 26.

[0016] Next, the internal configuration of the digital camera 500 will be described with reference to Fig. 2. Fig. 2 is an exploded perspective view of the digital camera 500. The arrows in Fig. 2 and subsequent figures indicate the directions for convenience when using the digital camera 500. As shown in Fig. 2, the digital camera 500 is composed of the rear cover 21, the front base 22, the top cover 23, the bottom cover 24, and the side cover 25 described above. Inside the digital camera 500, an image sensor section 11 equipped with an image blur correction mechanism, a main board 12, a duct section 510, a shutter 13, and a finder 32 are arranged.

[0017] The imaging element section 11 is composed of a movable unit 11b including an imaging element 11a and a fixed unit 11c. The main board 12 is equipped with a control IC group (control section) 12a for controlling imaging signals, a recording medium connector 12b for storing an external recording medium, and an external communication terminal 12c for connecting a connection cable with an external device. The external communication terminal 12c is covered with a terminal cover 25a as described above. The finder 32 is equipped with a finder display section 32a for displaying an image output from the imaging element section 11. A centrifugal fan is built into the duct section 510, which generates an air flow inside the duct section 510. The imaging element section 11 and the control IC group 12a are members of the digital camera 500 that consume a large amount of power, generate a large amount of heat, and are subject to rapid temperature rise. The shooting time of the digital camera 500 is limited by the guaranteed operating temperature of each member. In order to maintain the longest possible shooting time, it is necessary to take measures to cool the image sensor unit 11 and the control IC group 12a, which are heat sources, so as to prevent their temperatures from exceeding the guaranteed operating temperature.

[0018] 2, in this embodiment, duct section 510 is disposed between imaging element section 11, which includes an imaging element that is a heat source, and main board 12 (duct section 510 is disposed so as to be sandwiched between imaging element section 11 and main board 12). Then, as described later, control IC group 12a, which is a heat source of main board 12, is thermally coupled to duct section 510. Furthermore, by providing a means capable of heat exchange with the air flow inside duct section 510 from imaging element section 11, each heat source is cooled.

[0019] Next, the structure of this embodiment will be described with reference to Fig. 3(a), (b) and Fig. 4. Fig. 3(a) and (b) are exploded perspective views of the digital camera 500, in which the image sensor section 11, the duct section 510 and the main board 12 are extracted. Fig. 3(a) shows an exploded perspective view seen from the main board 12 side, and Fig. 3(b) shows an exploded perspective view seen from the image sensor section 11 side. Fig. 4 is a cross-sectional view including the optical axis 0, in which the image sensor section 11, the duct section 510 and the main board 12 are seen from the left direction.

[0020] The imaging element section 11 is composed of a movable unit 11b including the imaging element 11a, and a fixed unit 11c. The movable unit 11b includes an imaging element holding member 11d and a heat exchange member 521. The imaging element holding member 11d is a metal member that adhesively holds the imaging element 11a. The heat exchange member 521 is configured to transfer heat generated by the imaging element 11a. In this embodiment, the heat exchange member 521 is a metal member having at least one or more cylindrical cooling fin portions 521a, and is fastened and thermally connected to the imaging element holding member 11d. The material of the heat exchange member 521 is preferably, but not limited to, an aluminum alloy that has excellent heat transport capacity, is nonmagnetic, and is lightweight.

[0021] When the power supply of the digital camera 500 is turned on and the power supply to the imaging element section 11 starts, the imaging element 11a is driven to capture an image and generates heat according to the power consumed. The heat generated by the imaging element 11a is transferred to the imaging element holding member 11d, and a part of the heat is transferred to the cooling fin section 521a of the heat exchange member 521 that is thermally connected to the imaging element holding member 11d. A duct section 510 is disposed on the rear side of the imaging element section 11. The duct section 510 is composed of a duct base 511, a duct cover 512, and a centrifugal fan disposed within the duct base 511. The material of the duct base 511 and the duct cover 512 is preferably, like the heat exchange member 521, an aluminum alloy that has excellent heat transport capacity, is nonmagnetic, and is lightweight, but is not limited thereto.

[0022] An opening 512a is formed in the duct cover 512. The duct base 511 has an intake port 511a, an exhaust port 511d, and a cooling fin section (heat dissipation section) 511b formed between them. As shown in Fig. 3(b), the main board 12 is disposed on the back surface of the duct section 510. A thermally conductive rubber 525 is disposed between the thermal coupling section 511e of the duct base 511 and the control IC group 12a mounted on the main board 12, which is a heat source.

[0023] As shown in FIG. 4, the imaging element 11a of the imaging element section 11, the heat exchange member 521, the duct section 510, the heat conductive rubber 525, the control IC group 12a, and the main board 12 are arranged in this order from the front. The cooling fin section 521a of the heat exchange member 521, which moves integrally with the movable unit 11b of the imaging element section 11, is inserted into the inside of the duct section 510. Inside the duct section 510, an air flow is generated from the intake port section 511a to the exhaust port section 511d. The cooling fin section 521a of the heat exchange member 521 is inserted between the intake port section 511a and the exhaust port section 511d. The cooling fin section 521a is exposed to the air flow in the duct section 510, and transfers heat generated by the imaging element 11a to the air flow, and is cooled.

[0024] As in the prior art, a configuration is known in which a flexible graphite sheet is used to dissipate heat generated by the movable imaging element section 11. However, the graphite sheet has a limited amount of heat transport, and may not be able to reliably cool the imaging element 11a. On the other hand, in this embodiment, the cooling fin section 521a of the heat exchange member 521 that moves integrally with the movable unit 11b of the imaging element section 11 is cooled by air, so that the cooling capacity for the heat generated by the imaging element 11a is likely to be higher than that when a graphite sheet is used.

[0025] Next, the configuration of the imaging element section 11 will be described in detail with reference to Fig. 5 and Fig. 6. Fig. 5 is an exploded perspective view seen from the rear side of a movable unit 11b including an imaging element 11a and a fixed unit 11c, which constitute the imaging element section 11. Fig. 6 is an exploded perspective view seen from the opposite direction (front side) to Fig. 5.

[0026] The movable unit 11b is supported by the fixed unit 11c so as to be displaceable (movable) in a planar direction perpendicular to the optical axis 0. The movable unit 11b is displaced in a direction perpendicular to the optical axis 0, thereby realizing a function of optically correcting image blur. The movable unit 11b is mainly composed of the imaging element 11a, a coil group 11f for driving the movable unit 11b, a heat exchange member 521, a first shielding member 523, and an imaging element holding member 11d. Note that in this embodiment, the arrangement of the coil group 11f and its associated wiring, flexible boards, etc., and the driving method of the movable unit 11b are not relevant, so detailed explanations thereof will be omitted.

[0027] Cooling fin portion 521a of heat exchange member 521 extends in the opposite direction to imaging element 11a, and a flat portion is provided around it in a direction perpendicular to optical axis 0, and first shielding member 523 is in close contact with and fixed to this flat portion. First shielding member 523 is flexible in the direction along optical axis 0 (optical axis direction), and the surface opposite to the surface fixed to heat exchange member 521 is sliding surface 523a, which has surface properties with reduced frictional resistance. First shielding member 523 has opening 523b in the center, and is attached to heat exchange member 521 so that cooling fin portion 521a is inserted into opening 523b.

[0028] Next, the fixed unit 11c will be described. The fixed unit 11c is mainly composed of a magnet that drives the movable unit 11b, a yoke, a base plate 11e that holds them, a tilt absorbing member (buffer member) 522, and a second shielding member 524 fixed thereto. Note that in this embodiment, the arrangement of the magnet and the yoke are not relevant, so detailed description will be omitted.

[0029] The tilt absorbing member 522 includes a flexible elastic portion 522b and a holding portion 522a for holding the elastic portion 522b. An opening 522c is opened at the center of the holding portion 522a, and the elastic portion 522b is arranged to surround the periphery of the opening 522c. The second shielding member 524 is fixed in close contact with the surface of the tilt absorbing member 522 opposite to the elastic portion 522b, and is arranged so that the sliding surface 524a having a surface property with reduced friction resistance faces the sliding surface 523a of the first shielding member 523 on the movable unit 11b. At this time, the first shielding member 523 having flexibility is attached so as to be biased in a direction along the optical axis 0 by the second shielding member 524, and elastically deforms by a predetermined amount. This allows the sliding surface 523a and the sliding surface 524a to come into close contact with each other, preventing water droplets and dust from entering between them.

[0030] An opening (second opening) 524b is formed in the center of the second shielding member 524, and the cooling fin portion 521a is attached so as to be inserted (penetrate) through the opening 524b. The opening 524b is shaped to avoid collision with the cooling fin portion 521a within the range in which the movable unit 11b moves in a plane perpendicular to the optical axis 0 relative to the fixed unit 11c. The outer shape of the first shielding member 523 is set to be larger than the opening 524b so that there is no portion that does not overlap with the opening 524b of the second shielding member 524 in the direction along the optical axis 0 within the moving range of the movable unit 11b.

[0031] 2, when the imaging element unit 11 is fixed to the front base 22 via the base plate 11e, the mounting height is adjusted so that the imaging surface of the imaging element 11a is a predetermined optical distance from the mount 26. At this time, the base plate 11e is fixed to the front base 22 while its inclination is adjusted so that the inclination between the imaging surface and the mount 26 is a parallelism of a predetermined value or less. At this time, the inclination of the inclination adjustment member 522 constituting the imaging element unit 11 is also adjusted in the same manner, but the elastic part 522b having flexibility in the direction along the optical axis 0 elastically deforms and adheres closely to the duct cover 512. This blocks the space inside the duct part 510 from the space inside the digital camera 500.

[0032] Next, the configuration of the duct unit 510 of this embodiment will be described with reference to Figs. 7(a) and (b). Fig. 7(a) is an exploded perspective view of the duct unit 510 as viewed from the imaging element unit 11 side. Fig. 7(b) is an exploded perspective view of the duct unit 510 as viewed from the main board 12 side. In Figs. 7(a) and (b), the duct unit 510 forms a part of an air flow path with a duct base 511 and a duct cover 512. A centrifugal fan 531 for forcibly creating an air flow is disposed on the bottom side, screwed to the duct base 511, and covered with a duct bottom cover 513. The inside of the duct unit 510 and the inside of the digital camera 500 are separated, and air entering the inside of the duct unit 510 is unlikely to enter the inside of the digital camera 500.

[0033] Next, the air flow inside duct portion 510 will be described with reference to Figures 7(a), (b) and 8. Figure 8 is a diagram showing the internal configuration of duct portion 510, and shows a state in which duct cover 512 constituting duct portion 510 is absent.

[0034] The duct base 511 is formed with an intake port 511a which is an air inlet, and an exhaust port 511d for exhausting air. The centrifugal fan 531 is disposed near the exhaust port 511d of the duct base 511, and generates a forced air flow. The arrows in FIG. 8 indicate the air flow. A cooling fin portion 511b is formed in the air flow path between the intake port 511a and the exhaust port 511d to promote cooling of the duct base 511 by bringing the air into contact with more surfaces of the duct base 511. The cooling fin portion 511b of the duct base 511 has a rib shape that follows the air flow inside the duct portion 510, and is formed in a plurality of shapes that protrude from the duct base 511 toward the duct cover 512 (from the main board 12 toward the imaging element portion 11).

[0035] Further, an opening 512a is formed in the duct cover 512. As described above, the cooling fin portion 521a of the heat exchange member 521 on the imaging element unit 11 side is inserted into the opening 512a. The cooling fin portion 521a of the heat exchange member 521 on the imaging element unit 11 side is thermally coupled to the movable unit 11b and moves as one unit. Therefore, the opening 512a is opened to an extent that avoids collision with the cooling fin portion 521a within a range in which the movable unit 11b moves in a plane perpendicular to the optical axis 0. Furthermore, the opening 512a of the duct cover 512 is arranged at a position that overlaps with the area of ​​the cooling fin-less portion 511c, which is an area in which the cooling fin portion 511b of the duct base 511 is not formed, in the projection along the optical axis 0.

[0036] As shown in FIG. 7(b), a thermal coupling part 511e is formed on the surface of the duct base 511 facing the main board 12, which is thermally coupled to the control IC group 12a, which is the heat source of the main board 12, via a thermally conductive rubber or the like. Here, the cooling structure of the duct part 510 for cooling the heat generated in the control IC group 12a, which is the heat source of the main board 12, will be described. The heat generated from the control IC group 12a, which is the heat source of the main board 12, is transferred to the duct base 511 via the thermal coupling part 511e by the thermally conductive rubber. Next, the cooling fin part 511b of the duct base 511 to which the heat has been transferred comes into contact with the airflow generated by driving the centrifugal fan 531 inside the duct part 510, and is cooled. In this way, the duct part 510 has a cooling structure in which the heat generated from the control IC group 12a of the main board 12, which is the heat source, is constantly transferred to the cooling fin part 511b, and cooled by the airflow inside the duct part 510.

[0037] As described above, the duct base 511 is formed with the thermal coupling portion 511e corresponding to the control IC group 12a which is the heat source of the main board 12, and the cooling fin portion 511b on the surface on the air flow path side. Here, the area in which the cooling fin portion 511b is formed is disposed in an area that does not overlap in projection with the area in which the cooling fin portion 521a on the imaging element portion 11 side is inserted. In addition, since the cooling fin portion 521a on the imaging element portion 11 side is movable, the cooling fin portion 511b of the duct base 511 is formed in an area other than the movable area.

[0038] Heat generated in the control IC group 12a on the main board 12 side and heat generated in the imaging element unit 11 are transferred to the cooling fin portion 521a and the cooling fin portion 511b, which are thermally coupled to each other. The cooling fin portion 521a of the imaging element unit 11 and the cooling fin portion 511b of the duct portion 510 are constantly in contact with the airflow generated inside the duct portion 510. By constantly exposing the cooling fin portion 521a and the cooling fin portion 511b to air, it becomes possible to simultaneously suppress temperature rises in both the imaging element unit 11, which is a heat source, and the control IC group 12a of the main board 12.

[0039] Next, the shape of cooling fin portion 521a of heat exchange member 521, which moves integrally with and is thermally coupled to movable unit 11b of imaging element section 11, will be described with reference to Fig. 9. Fig. 9 is a diagram showing the internal configuration of duct section 510, and shows a state in which cooling fin portion 521a of heat exchange member 521 of imaging element section 11 is disposed inside duct section 510.

[0040] Generally, the larger the surface area of ​​a structural member for cooling such as the duct base 511 that is in contact with air, the higher the cooling capacity. The cooling fin section 511b formed on the duct base 511 is disposed between the intake port section 511a and the exhaust port section 511d, and has a ribbed shape that does not impede the flow of air. The cooling fin section 511b has a ribbed shape in order to increase the surface area that is in contact with air as much as possible.

[0041] In this embodiment, the cooling fin portion 521a of the heat exchange member 521 thermally coupled with the imaging element section 11 is inserted inside the duct section 510. As shown in FIG. 5 and FIG. 9, the cooling fin portion 521a of the heat exchange member 521 in this embodiment has a plurality of substantially cylindrical shapes. The cooling fin portion 521a of the heat exchange member 521 is configured to move integrally with the movable unit portion 11b of the imaging element section 11. Therefore, when the cooling fin portion 521a is formed with a rib shape similar to that of the cooling fin portion 511b arranged inside the duct section 510, the air flow inside the duct section 510 may be obstructed depending on the position when the movable unit 11b moves. In particular, since the movable unit 11b of the imaging element section 11 not only moves in a parallel manner but also moves in a rotational manner, when the cooling fin portion 521a has a rib shape similar to that of the cooling fin portion 511b, the air flow is more likely to be obstructed.

[0042] If the movable unit 11b moves against the air flow, the moving load increases, which may affect the blur correction function and prevent blur correction from being performed properly. However, by making the cooling fin part 521a of the heat exchange member 521 substantially cylindrical, it is possible to eliminate the variation in the load caused by the movement of the movable unit 11b and to always maintain a constant load. If the movable unit 11b can always move with a constant load, it is possible to always achieve accurate blur correction.

[0043] 4 and 7, in this embodiment, first shielding member 523, second shielding member 524, and opening 512a of duct cover 512 are arranged in this order from the front inside duct section 510 between air intake port 511a and centrifugal fan 531. This makes it possible to utilize negative pressure generated in a direction that urges first shielding member 523 toward second shielding member 524 by airflow inside duct section 510 generated by driving centrifugal fan 531. When first shielding member 523 is urged toward second shielding member 524, adhesion is increased, which is suitable for preventing water droplets and dust from entering between them.

[0044] As a modification of this embodiment, second shielding member 524, first shielding member 523, and opening 512a of duct cover 512 may be arranged, in that order from the front, inside duct portion 510 between exhaust port portion 511d and centrifugal fan 531. This makes it possible to utilize the positive pressure generated in the direction of biasing first shielding member 523 toward second shielding member 524 by the airflow inside duct portion 510 generated by driving centrifugal fan 531.

[0045] As another modified example of this embodiment, second shielding member 524 may be omitted, and a configuration in which tilt adjustment member 522 or duct cover 512 slides on first shielding member 523 may be employed.

[0046] [Second embodiment] Next, a second embodiment of the present invention will be described with reference to Fig. 10 and Fig. 11. Fig. 10 is a perspective view of a heat exchange member 621 in this embodiment. Fig. 11 is a cross-sectional view of the imaging element section 11, the duct section 510, and the main board 12 in this embodiment.

[0047] The heat exchange member 621 moves integrally with the movable unit 11b of the imaging element section 11, similarly to the heat exchange member 521 of the first embodiment. As shown in FIG. 10 and FIG. 11, the cooling fin section 621a of the heat exchange member 621 of the imaging element section 11 has a substantially cylindrical shape in the range E1 inserted inside the duct section 510. However, in the range E2 not inserted inside the duct section 510, the substantially cylindrical shapes are connected to form the cooling rib shape section 621b. As described above, the cooling fin section 621a has a higher cooling capacity as the surface area in contact with air increases. By forming the cooling rib shape section 621b in the range E2 not inserted inside the duct section 510, the entire volume of the heat exchange member 621 increases without impeding the flow of air inside the duct section 510, and the heat capacity increases accordingly, so that it is possible to increase the cooling capacity.

[0048] [Third embodiment] Next, a third embodiment of the present invention will be described with reference to Figures 12(a) and (b), which are configuration diagrams of a heat exchange member 721 in this embodiment.

[0049] The heat exchange member 721, like the heat exchange members in each of the above-described embodiments, is driven integrally with the movable unit 11b of the imaging element section 11. Here, the cooling fin section 721a of the heat exchange member 721 has a substantially cylindrical shape in which the cooling fin section 721b located near the center of the optical axis 0 extends furthest toward the duct section 510, and becomes lower as it moves away from the center of the optical axis 0.

[0050] 12(b), in the heat exchange member 721, the cooling fin portion 721b near the optical axis 0 has the longest length (first length) L1, and the cooling fin portion 721c at the position furthest from the optical axis 0 has the shortest length (second length) L2. That is, the heat exchange member 721 has a first length extending in the optical axis direction in a first region including the optical axis 0, and a second length extending in the optical axis direction in a second region farther from the optical axis 0 than the first region, and the first length is longer than the second length.

[0051] Similar to the assembly of the imaging element unit 11, the heat exchange member 721 is also assembled while being tilted. When the imaging element unit 11 is fixed while its tilt is adjusted, the cooling fin unit 721a is also tilted. In a configuration in which the cooling fin unit 721a is inserted inside the duct unit 510, the imaging element unit 11 is assembled while its tilt is adjusted, but the duct unit 510 does not tilt. Therefore, a part of the cooling fin unit 721a may interfere with the duct base 511 of the duct unit 510. However, in this embodiment, the cooling fin unit 721a is located near the optical axis 0 of the cooling fin unit 721a, which is the cooling fin unit 721b that extends the most toward the duct unit 510, and the cooling fin unit 721c that becomes lower as it moves away from the optical axis 0. With this configuration, even if the imaging element unit 11 is fixed while its tilt is adjusted, it does not interfere with the duct base 511.

[0052] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described with reference to Fig. 4 and Fig. 13. In this embodiment, the shapes of the first shielding member 523 and the second shielding member 524 will be described. Fig. 13 is a configuration diagram of the heat exchange member 521, the cooling fin portion 521a, the first shielding member 523, and the second shielding member 524 in this embodiment, and shows a view seen in a direction along the optical axis 0 from the duct portion 510 side. In Fig. 13, other configurations are omitted for simplicity. Also, in Fig. 13, the area of ​​the first shielding member 523 that overlaps with the second shielding member 524 is shown as an overlapping portion 523c.

[0053] As shown in FIG. 13(a), when there is no external shake, the digital camera 500 is stationary, and the movable unit 11b is energized, the central axis 11g of the image sensor 11a is configured to coincide with the optical axis 0. When external vibration is applied to this state, the movable unit 11b is controlled to move relative to the fixed unit 11c in a plane direction perpendicular to the optical axis 0 in order to reduce the shake. At that time, frictional force is generated in the sliding portion between the first shielding member 523 and the second shielding member 524, so it is necessary to keep the power consumption to resist the frictional force as small as possible. For this reason, it is preferable to reduce the sliding area between the first shielding member 523 and the second shielding member 524, i.e., the area of ​​the overlapping portion 523c.

[0054] 13(b) shows a state in which the movable unit 11b is driven in a translational direction and a rotational direction relative to the fixed unit 11c as indicated by the arrows for blur correction. In this case, when attention is paid to the central axis 11g of the imaging element 11a, the central axis 11g moves from the optical axis 0, and the imaging element 11a rotates around the central axis 11g. Here, the cooling fin portion 521a also rotates around the central axis 11g at the same time, but the further the outer shape of the cooling fin portion 521a is from the central axis 11g of the imaging element 11a, the larger the range over which the cooling fin portion 521a moves due to the rotation.

[0055] Therefore, in this embodiment, as shown in FIG. 13(a), the central axis 521b of the cooling fin portion 521a in the planar direction perpendicular to the optical axis 0 is arranged to coincide with the central axis 11g of the imaging element 11a. By arranging in this manner, even when the movable unit 11b is driven in the translational and rotational directions as shown by the arrows relative to the fixed unit 11c, the movement range of the cooling fin portion 521a can be reduced. That is, it is possible to reduce the area of ​​the opening 524b of the second shielding member 524 for avoiding the movement range of the cooling fin portion 521a. The shape of the opening 524b of the shielding member 524 may be substantially circular as shown in FIG. 13(a) and (b). This makes it possible to further reduce the area of ​​the opening 524b for avoiding the cooling fin portion 521a with respect to the movement of the movable unit 11b. If the area of ​​opening 524b can be reduced, the outer shape of first shielding member 523 can be made smaller, and the sliding area between first shielding member 523 and second shielding member 524 can be reduced.

[0056] 13(c) and (d), it is preferable that the outer shape of the first shielding member 523 is similar to the opening 524b of the second shielding member 524. This can further reduce the sliding area between the first shielding member 523 and the second shielding member 524, i.e., the overlapping portion 523c, when the movable unit 11b is driven.

[0057] As described above, in each embodiment, the imaging device (digital camera 500) has an imaging element section 11 having a fixed unit 11c and a movable unit 11b movable relative to the fixed unit, and a duct section 510 forming an air flow path. The movable unit has an imaging element 11a and a heat exchange member 521 (621, 721). At least a part of the heat exchange member is inserted into the duct section through an opening 512a of the duct section.

[0058] Preferably, the movable unit has a first shielding member 523. The first shielding member seals a flow path from the internal space of the duct part to the external space (the space in which the image sensor part 11 exists) at the opening of the duct part. More preferably, the first shielding member surrounds the periphery of the heat exchange member, and is configured to seal a flow path from the internal space of the duct part to the external space even when the movable unit moves. Also preferably, the first shielding member is circular (approximately circular). Also preferably, the fixed unit has a second shielding member (524) that slides with the first shielding member and seals a flow path from the internal space of the duct part to the external space at the opening of the duct part. More preferably, the second shielding member has a second opening (opening 524b) through which the heat exchange member passes, and the second opening is circular (approximately circular).

[0059] Preferably, the fixed unit has a buffer member (tilt absorbing member 522) having an elastic portion (522b) that seals the flow path from the internal space of the duct portion to the external space. The elastic portion is pressed against the duct portion while surrounding the periphery of the heat exchange member, thereby sealing the flow path from the internal space of the duct portion to the external space. Also preferably, the imaging device has a main board 12 having a control portion (control IC group 12a). At least a part of the duct portion overlaps with each of the imaging element portion and the main board in the optical axis direction, and is disposed between the imaging element portion and the main board. More preferably, the duct portion has a heat dissipation portion (cooling fin portion 511b). The heat dissipation portion has a plurality of rib shapes that protrude from the main board toward the imaging element portion and are aligned with the air flow in the internal space of the duct portion. The heat dissipation portion is disposed outside the movable range of the heat exchange member.

[0060] Preferably, at least a part of the heat exchange member (cooling fin portion 521a) inserted inside the duct portion is cylindrical (approximately cylindrical). Also preferably, at least a part of the heat exchange member (cooling rib portion 621b) not inserted inside the duct portion among the heat exchange members 621 is ribbed along the air flow in the internal space of the duct portion.

[0061] According to each embodiment, it is possible to provide an imaging device capable of efficiently dissipating heat generated in an imaging element that is movable in a direction perpendicular to the optical axis.

[0062] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0063] 11. Image sensor section 11a Image sensor 11b Movable unit 11c Fixed Unit 500 Digital camera (imaging device) 510 Duct section 512a opening 521, 621, 721 Heat exchanger

Claims

1. an imaging element section having a fixed unit and a movable unit movable relative to the fixed unit; A duct portion that forms an air flow path, the movable unit has an imaging element and a heat exchange member, At least a portion of the heat exchange member is inserted into the duct portion through an opening of the duct portion, The movable unit has a first shielding member that surrounds the heat exchange member, an imaging device characterized in that the first shielding member is configured to seal a flow path from the internal space of the duct portion to the external space at the opening of the duct portion even when the movable unit moves.

2. an imaging element section having a fixed unit and a movable unit movable relative to the fixed unit; A duct portion that forms an air flow path; A main board having a control unit, at least a portion of the duct portion overlaps with each of the imaging element portion and the main board in the optical axis direction, and is disposed between the imaging element portion and the main board; the movable unit has an imaging element and a heat exchange member, the cooling fin portion of the heat exchange member is inserted into the duct portion through an opening of the duct portion, The duct portion has a heat dissipation portion, the heat dissipation section has a plurality of rib shapes that protrude from the main board toward the imaging element section and are aligned with an air flow in an internal space of the duct section, The imaging device according to claim 1, wherein the plurality of rib shapes are arranged outside a movable range of the cooling fin portion of the heat exchange member when viewed in the optical axis direction.

3. The imaging device according to claim 1 , wherein the heat exchange member is configured to transfer heat generated in the imaging element.

4. The imaging device according to claim 1 , wherein the first shielding member is circular.

5. 5. The imaging device according to claim 1, wherein the fixed unit has a second shielding member that slides against the first shielding member and seals a flow path from the internal space of the duct portion to the external space at the opening of the duct portion.

6. the second shielding member has a second opening through which the heat exchange member passes, The imaging device according to claim 5 , wherein the second opening is circular.

7. the fixed unit has a buffer member having an elastic portion that seals a flow path from an internal space of the duct portion to an external space, The imaging device according to any one of claims 1, 3 to 6, characterized in that the elastic portion is pressed against the duct portion while surrounding the heat exchange member, thereby sealing the flow path from the internal space of the duct portion to the external space.

8. Further comprising a main board having a control unit, The imaging device according to any one of claims 1, 3 to 7, characterized in that at least a portion of the duct portion overlaps with each of the imaging element portion and the main board in the optical axis direction, and is disposed between the imaging element portion and the main board.

9. The duct portion has a heat dissipation portion, the heat dissipation section has a plurality of rib shapes that protrude from the main board toward the imaging element section and are aligned with an air flow in an internal space of the duct section, 9. The imaging device according to claim 8, wherein the heat dissipation portion is disposed outside a movable range of the heat exchange member.

10. 10. The imaging device according to claim 1, wherein at least a portion of the heat exchange member inserted into the duct portion has a cylindrical shape.

11. 11. The imaging device according to claim 1, wherein at least a portion of the heat exchange member that is not inserted inside the duct portion has a ribbed shape that follows the air flow in the internal space of the duct portion.

12. The heat exchange member has a first length extending in the optical axis direction in a first region including the optical axis, and a second length extending in the optical axis direction in a second region farther from the optical axis than the first region, 12. The imaging device according to claim 1, wherein the first length is longer than the second length.

13. 13. The imaging apparatus according to claim 1, wherein the movable unit is movable in a direction perpendicular to an optical axis in order to correct image blur.

Images